Step 06b.15 — Re-tension the A/B belts to 110 Hz (provisional, cold)¶
Step 41 of 42 with a helper · Chapter 06 — Z axis (and Chapter 06b — Gantry squaring)
(no image — see text)
Parts: none.
Do: Move the X extrusion until the X/Y idler centres are 150 mm from the front idlers. Pluck that span and adjust each front tensioner to ≈110 Hz, going back and forth until both match. Move the extrusion and re-check.
Check
A and B read within a few Hz of each other at ~110 Hz, and still do after the gantry has moved and returned.
Helper Holds the phone at each belt span and reads the lowest peak aloud after each pluck.
What you're looking at
The A/B belts get their second tension here, still provisional, because 06b.6 released whatever Ch 07 set. 110 Hz measured over a 150 mm span is Voron's figure; a plucked frequency only means something with a stated span.
Voron step 13. 110 Hz ≈ 2 lb, deliberately at the low end. Ignore voronldo.com's 80–100 Hz figure for a 350: it names no span, which is what makes a frequency meaningful (survey §4.3). This is a cold, open-machine working value; Ch 14 Step 14.4 sets it for the last time with the panels on, cold and door open, just before the soak, so do not chase the last few Hz here. src
Source: Voron docs § V2 Gantry Squaring, step 13 · Voron docs § Secondary printer tuning — A/B and Z belts · survey §4.3 / §7.5